python fork warning

[xross]

/home/jenkins/.pyenv/versions/3.12.1/lib/python3.12/multiprocessing/popen_fork.py:66: DeprecationWarning: This process (pid=2491720) is multi-threaded, use of fork() may lead to deadlocks in the child.

[xross]

#66

[xross]

Backed out "fix" as it was causing test failures in another repo.